In conversational American
English, short expressionsof agreement are commonly used
when one person hasthe same idea as
another. These
short expressions haveseveraldifferent forms. One type is used for two
statementswhich are both affirmative ( + ):

A
says:

I'm
cold.

B
thinks:

I'm
also cold.

B
says:

Me,
too.

Me, too can be used to refer to any verb
tense or verb
form:

A
says:

B thinks the samething and
says:

I'm
hungry.

Me,
too.

I want some chocolate.

Me, too.

I'm feeling
tired.

Me,
too.

I was also tired yesterday.

Me, too.

I could go to sleep
right now.

Me,
too.

I've been working hard.

Me, too.

I worked hard
yesterday.

Me,
too.

I'll work hard tomorrow.

Me, too.

I'd love to take a
vacation!

Me,
too!

_______________________________________________

Another
type of short expression
of agreement for twoaffirmative
( + ) statements is also very common,
but itsgrammar
is
more complicated:

A
says:

B thinks the samething and
says:

I'm
hungry.

So
am I.

I want some
chocolate.

So
do I.

I'm feeling
tired.

So
am I.

I was also tired
yesterday.

So
was I.

I could go to sleep
right now.

So
could I.

I've been working
hard.

So
have I.

I worked hard
yesterday.

So
did I.

I'll work hard
tomorrow.

So
will I.

I'd love to take a
vacation!

So
would I.

This
type of short expression
of agreement has three
parts:

1

2

3

So

BE, auxiliary, do
/ does
/ did

subject

The second part "echoes"
the verb
form in the first sentence(BE, an auxiliaryverb, or--if the verb isn't BE
and doesn'thave an auxiliary--do / does / did).

A says:

B thinks the samething and
says:

Susie's from Texas.

So is Bill.

Susie comes from
Texas.

So
does Bill.

John's living in
Chicago.

So
are Tom and Kay.

You
were at the mall.

So were you.

I should do my
homework.

So
should all of us.

We've
been working hard.

So have they.

Betty worked hard
yesterday.

So
did Lucy.

Joe will help
us.

So
will Tony.

I'd better leave
now.

So
had I.

Special Note:

As you can see, part 3 of
the form with so can be a pronounor a noun phrase.
More examples: